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2. O. Stenzel, Optical Coatings. Material Aspects in Theory and Practice (Springer 2014), pp. 227–238
3. V. Kondratyev, The Structure of Atoms and Molecules (2nd printing, Mir Publishers 1967), Chap. 7
4. W. Demtröder, Atoms, Molecules, and Photons (Springer 2010), pp. 327–330
5. Л.Д.Лaндay, E.M.Лифшиц, Квaнтoвaя Mexaникa, Hepeлятивиcтcкaя Teopия, Mocквa “Hayкa” (1974), pp. 96–97